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It's an open issue https://github.com/rancher/fleet/issues/697 Right now, everything has to live in the GitRepo of your Fleet config; there doesn't seem to be any sub git processor to pull remote resources

It looks like a kustomize library itself is to blame here. I tried to build fleet from source and feed

fleet test

with it, it works and if I change remote source to be a git path, I have different error:

git not found in PATH

. It looks like fleet-controller simply lacks git program installed.

Agreed and it's pretty frustrating.

You can use the google

kpt

tool to workaround the problem by pre-downloading the manifests.